Maybe, maybe not. I just said
your reasons weren't really valid:
1) We don't know whether the delay is for a base respin or not
2) We don't know for certain that it actually
will be released in May or not. nVidia don't have a good record on sticking to release dates recently
3) We don't know if it will be fixed
There isn't enough information in the public domain to determine whether Charlie is right or not. IMO if you accept that his basic facts are correct (very poor yields, heat and clock issues) and link them with what ATi have said about their problems with the 40nm process his conclusions aren't unreasonable. I'll trust him on needing 6 months for a base respin unless someone with actual knowledge of the processes involved disputes it, but it sounds reasonable.
Time will tell whether his predictions are right or wrong, most likely it'll be a bit of both. What is pointless is people just saying 'ah he's not trust worthy' without debating the facts or conclusions he draws from them, which could actually be interesting